George Onslow may refer to:
George Onslow (British Army officer) (1731–1792), British politician and army officer George Onslow, 1st Earl of Onslow (1731–1814), British peer and politician George Onslow (composer) (1784–1853), French composer
See also George Macarthur-Onslow (1875–1931), Australian general who served in World War I